解题思路:(1)(4)(5)(7)运用乘法分配律解答,
(2)运用减法性质解答,
(3)运用乘法交换律和结合律解答,
(6)(8)依据四则运算顺序:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,
(1)(125+19)×8,
=125×8+19×8,
=1000+152,
=1152;
(2)666-(309+266),
=666-266-309,
=400-309,
=91;
(3)75×2×7×4,
=(75×4)×(2×7),
=300×14,
=4200;
(4)125×(800-8),
=125×800-125×8,
=100000-1000,
=99000;
(5)24×24+76×24,
=(24+76)×24,
=100×24,
=2400;
(6)5000-666÷37×34,
=5000-18×34,
=5000-612,
=4388;
(7)29×75+72×75-75,
=(29+72-1)×75,
=100×75,
=7500;
(8)7800÷[300+5×(66+134)],
=7800÷[300+5×200],
=78000÷1300,
=60.
点评:
本题考点: 整数四则混合运算;运算定律与简便运算.
考点点评: 本题主要考查学生依据四则运算顺序,以及正确运用简便方法解决问题的能力.